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source: palm/trunk/SOURCE/init_grid.f90 @ 1025

Last change on this file since 1025 was 1017, checked in by raasch, 12 years ago
last commit documented
Property svn:keywords set to `Id`
File size: 55.3 KB

Rev	Line
[1]	1	SUBROUTINE init_grid
	2
	3	!------------------------------------------------------------------------------!
[254]	4	! Current revisions:
[1]	5	! -----------------
[863]	6	!
[1017]	7	!
[863]	8	! Former revisions:
	9	! -----------------
	10	! $Id: init_grid.f90 1017 2012-09-27 11:28:50Z letzel $
	11	!
[1017]	12	! 1015 2012-09-27 09:23:24Z raasch
	13	! lower index for calculating wall_flags_0 set to nzb_w_inner instead of
	14	! nzb_w_inner+1
	15	!
[997]	16	! 996 2012-09-07 10:41:47Z raasch
	17	! little reformatting
	18	!
[979]	19	! 978 2012-08-09 08:28:32Z fricke
	20	! Bugfix: nzb_max is set to nzt at non-cyclic lateral boundaries
	21	! Bugfix: Set wall_flags_0 for inflow boundary
	22	!
[928]	23	! 927 2012-06-06 19:15:04Z raasch
	24	! Wall flags are not set for multigrid method in case of masking method
	25	!
[865]	26	! 864 2012-03-27 15:10:33Z gryschka
[927]	27	! In case of ocean and Dirichlet bottom bc for u and v dzu_mg and ddzu_pres
	28	! were not correctly defined for k=1.
[865]	29	!
[863]	30	! 861 2012-03-26 14:18:34Z suehring
[861]	31	! Set wall_flags_0. The array is needed for degradation in ws-scheme near walls,
	32	! inflow and outflow boundaries as well as near the bottom and the top of the
[863]	33	! model domain.!
[861]	34	! Initialization of nzb_s_inner and nzb_w_inner.
	35	! gls has to be at least nbgp to do not exceed the array bounds of nzb_local
	36	! while setting wall_flags_0
	37	!
[844]	38	! 843 2012-02-29 15:16:21Z gryschka
	39	! In case of ocean and dirichlet bc for u and v at the bottom
	40	! the first u-level ist defined at same height as the first w-level
	41	!
[819]	42	! 818 2012-02-08 16:11:23Z maronga
	43	! Bugfix: topo_height is only required if topography is used. It is thus now
	44	! allocated in the topography branch
	45	!
[810]	46	! 809 2012-01-30 13:32:58Z maronga
	47	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	48	!
[808]	49	! 807 2012-01-25 11:53:51Z maronga
	50	! New cpp directive "__check" implemented which is used by check_namelist_files
	51	!
[760]	52	! 759 2011-09-15 13:58:31Z raasch
	53	! Splitting of parallel I/O in blocks of PEs
	54	!
[723]	55	! 722 2011-04-11 06:21:09Z raasch
	56	! Bugfix: bc_lr/ns_cyc replaced by bc_lr/ns, because variables are not yet set
	57	! here
	58	!
[710]	59	! 709 2011-03-30 09:31:40Z raasch
	60	! formatting adjustments
	61	!
[708]	62	! 707 2011-03-29 11:39:40Z raasch
	63	! bc_lr/ns replaced by bc_lr/ns_cyc
	64	!
[668]	65	! 667 2010-12-23 12:06:00Z suehring/gryschka
[667]	66	! Definition of new array bounds nxlg, nxrg, nysg, nyng on each PE.
	67	! Furthermore the allocation of arrays and steering of loops is done with these
	68	! parameters. Call of exchange_horiz are modified.
	69	! In case of dirichlet bounday condition at the bottom zu(0)=0.0
	70	! dzu_mg has to be set explicitly for a equally spaced grid near bottom.
	71	! ddzu_pres added to use a equally spaced grid near bottom.
[139]	72	!
[556]	73	! 555 2010-09-07 07:32:53Z raasch
[818]	74	! Bugfix: default setting of nzb_local for flat topography
[556]	75	!
[392]	76	! 274 2009-03-26 15:11:21Z heinze
	77	! Output of messages replaced by message handling routine.
	78	! new topography case 'single_street_canyon'
	79	!
[226]	80	! 217 2008-12-09 18:00:48Z letzel
	81	! +topography_grid_convention
	82	!
[139]	83	! 134 2007-11-21 07:28:38Z letzel
[134]	84	! Redefine initial nzb_local as the actual total size of topography (later the
	85	! extent of topography in nzb_local is reduced by 1dx at the E topography walls
	86	! and by 1dy at the N topography walls to form the basis for nzb_s_inner);
	87	! for consistency redefine 'single_building' case.
[114]	88	! Calculation of wall flag arrays
[1]	89	!
[98]	90	! 94 2007-06-01 15:25:22Z raasch
	91	! Grid definition for ocean version
	92	!
[77]	93	! 75 2007-03-22 09:54:05Z raasch
	94	! storage of topography height arrays zu_s_inner and zw_s_inner,
	95	! 2nd+3rd argument removed from exchange horiz
	96	!
[39]	97	! 19 2007-02-23 04:53:48Z raasch
	98	! Setting of nzt_diff
	99	!
[3]	100	! RCS Log replace by Id keyword, revision history cleaned up
	101	!
[1]	102	! Revision 1.17 2006/08/22 14:00:05 raasch
	103	! +dz_max to limit vertical stretching,
	104	! bugfix in index array initialization for line- or point-like topography
	105	! structures
	106	!
	107	! Revision 1.1 1997/08/11 06:17:45 raasch
	108	! Initial revision (Testversion)
	109	!
	110	!
	111	! Description:
	112	! ------------
	113	! Creating grid depending constants
	114	!------------------------------------------------------------------------------!
	115
	116	USE arrays_3d
	117	USE control_parameters
	118	USE grid_variables
	119	USE indices
	120	USE pegrid
	121
	122	IMPLICIT NONE
	123
[240]	124	INTEGER :: bh, blx, bly, bxl, bxr, byn, bys, ch, cwx, cwy, cxl, cxr, cyn, &
[759]	125	cys, gls, i, ii, inc, i_center, j, j_center, k, l, nxl_l, &
	126	nxr_l, nyn_l, nys_l, nzb_si, nzt_l, vi
[1]	127
	128	INTEGER, DIMENSION(:), ALLOCATABLE :: vertical_influence
	129
	130	INTEGER, DIMENSION(:,:), ALLOCATABLE :: corner_nl, corner_nr, corner_sl, &
	131	corner_sr, wall_l, wall_n, wall_r,&
	132	wall_s, nzb_local, nzb_tmp
	133
[861]	134	LOGICAL :: flag_set = .FALSE.
	135
[1]	136	REAL :: dx_l, dy_l, dz_stretched
	137
[818]	138	REAL, DIMENSION(:,:), ALLOCATABLE :: topo_height
[1]	139
	140	REAL, DIMENSION(:,:,:), ALLOCATABLE :: distance
[667]	141
[1]	142	!
[709]	143	!-- Calculation of horizontal array bounds including ghost layers
[667]	144	nxlg = nxl - nbgp
	145	nxrg = nxr + nbgp
	146	nysg = nys - nbgp
	147	nyng = nyn + nbgp
[709]	148
[667]	149	!
[1]	150	!-- Allocate grid arrays
	151	ALLOCATE( ddzu(1:nzt+1), ddzw(1:nzt+1), dd2zu(1:nzt), dzu(1:nzt+1), &
[667]	152	dzw(1:nzt+1), l_grid(1:nzt), zu(nzb:nzt+1), zw(nzb:nzt+1) )
[1]	153
	154	!
	155	!-- Compute height of u-levels from constant grid length and dz stretch factors
	156	IF ( dz == -1.0 ) THEN
[254]	157	message_string = 'missing dz'
	158	CALL message( 'init_grid', 'PA0200', 1, 2, 0, 6, 0 )
[1]	159	ELSEIF ( dz <= 0.0 ) THEN
[254]	160	WRITE( message_string, * ) 'dz=',dz,' <= 0.0'
	161	CALL message( 'init_grid', 'PA0201', 1, 2, 0, 6, 0 )
[1]	162	ENDIF
[94]	163
[1]	164	!
[94]	165	!-- Define the vertical grid levels
	166	IF ( .NOT. ocean ) THEN
	167	!
	168	!-- Grid for atmosphere with surface at z=0 (k=0, w-grid).
[843]	169	!-- The second u-level (k=1) corresponds to the top of the
[94]	170	!-- Prandtl-layer.
[667]	171
	172	IF ( ibc_uv_b == 0 .OR. ibc_uv_b == 2 ) THEN
	173	zu(0) = 0.0
	174	! zu(0) = - dz * 0.5
	175	ELSE
	176	zu(0) = - dz * 0.5
	177	ENDIF
[94]	178	zu(1) = dz * 0.5
[1]	179
[94]	180	dz_stretch_level_index = nzt+1
	181	dz_stretched = dz
	182	DO k = 2, nzt+1
	183	IF ( dz_stretch_level <= zu(k-1) .AND. dz_stretched < dz_max ) THEN
	184	dz_stretched = dz_stretched * dz_stretch_factor
	185	dz_stretched = MIN( dz_stretched, dz_max )
	186	IF ( dz_stretch_level_index == nzt+1 ) dz_stretch_level_index = k-1
	187	ENDIF
	188	zu(k) = zu(k-1) + dz_stretched
	189	ENDDO
[1]	190
	191	!
[94]	192	!-- Compute the w-levels. They are always staggered half-way between the
[843]	193	!-- corresponding u-levels. In case of dirichlet bc for u and v at the
	194	!-- ground the first u- and w-level (k=0) are defined at same height (z=0).
	195	!-- The top w-level is extrapolated linearly.
[94]	196	zw(0) = 0.0
	197	DO k = 1, nzt
	198	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	199	ENDDO
	200	zw(nzt+1) = zw(nzt) + 2.0 * ( zu(nzt+1) - zw(nzt) )
[1]	201
[94]	202	ELSE
[1]	203	!
[843]	204	!-- Grid for ocean with free water surface is at k=nzt (w-grid).
	205	!-- In case of neumann bc at the ground the first first u-level (k=0) lies
	206	!-- below the first w-level (k=0). In case of dirichlet bc the first u- and
	207	!-- w-level are defined at same height, but staggered from the second level.
	208	!-- The second u-level (k=1) corresponds to the top of the Prandtl-layer.
[94]	209	zu(nzt+1) = dz * 0.5
	210	zu(nzt) = - dz * 0.5
	211
	212	dz_stretch_level_index = 0
	213	dz_stretched = dz
	214	DO k = nzt-1, 0, -1
	215	IF ( dz_stretch_level <= ABS( zu(k+1) ) .AND. &
	216	dz_stretched < dz_max ) THEN
	217	dz_stretched = dz_stretched * dz_stretch_factor
	218	dz_stretched = MIN( dz_stretched, dz_max )
	219	IF ( dz_stretch_level_index == 0 ) dz_stretch_level_index = k+1
	220	ENDIF
	221	zu(k) = zu(k+1) - dz_stretched
	222	ENDDO
	223
	224	!
	225	!-- Compute the w-levels. They are always staggered half-way between the
[843]	226	!-- corresponding u-levels, except in case of dirichlet bc for u and v
	227	!-- at the ground. In this case the first u- and w-level are defined at
	228	!-- same height. The top w-level (nzt+1) is not used but set for
	229	!-- consistency, since w and all scalar variables are defined up tp nzt+1.
[94]	230	zw(nzt+1) = dz
	231	zw(nzt) = 0.0
	232	DO k = 0, nzt
	233	zw(k) = ( zu(k) + zu(k+1) ) * 0.5
	234	ENDDO
	235
[843]	236	!
	237	!-- In case of dirichlet bc for u and v the first u- and w-level are defined
	238	!-- at same height.
	239	IF ( ibc_uv_b == 0 ) THEN
	240	zu(0) = zw(0)
	241	ENDIF
	242
[94]	243	ENDIF
	244
	245	!
[1]	246	!-- Compute grid lengths.
	247	DO k = 1, nzt+1
	248	dzu(k) = zu(k) - zu(k-1)
	249	ddzu(k) = 1.0 / dzu(k)
	250	dzw(k) = zw(k) - zw(k-1)
	251	ddzw(k) = 1.0 / dzw(k)
	252	ENDDO
	253
	254	DO k = 1, nzt
	255	dd2zu(k) = 1.0 / ( dzu(k) + dzu(k+1) )
	256	ENDDO
[667]	257
	258	!
[709]	259	!-- The FFT- SOR-pressure solvers assume grid spacings of a staggered grid
	260	!-- everywhere. For the actual grid, the grid spacing at the lowest level
	261	!-- is only dz/2, but should be dz. Therefore, an additional array
	262	!-- containing with appropriate grid information is created for these
	263	!-- solvers.
	264	IF ( psolver /= 'multigrid' ) THEN
[667]	265	ALLOCATE( ddzu_pres(1:nzt+1) )
	266	ddzu_pres = ddzu
[864]	267	ddzu_pres(1) = ddzu_pres(2) ! change for lowest level
[667]	268	ENDIF
[1]	269
	270	!
	271	!-- In case of multigrid method, compute grid lengths and grid factors for the
	272	!-- grid levels
	273	IF ( psolver == 'multigrid' ) THEN
	274
	275	ALLOCATE( ddx2_mg(maximum_grid_level), ddy2_mg(maximum_grid_level), &
	276	dzu_mg(nzb+1:nzt+1,maximum_grid_level), &
	277	dzw_mg(nzb+1:nzt+1,maximum_grid_level), &
	278	f1_mg(nzb+1:nzt,maximum_grid_level), &
	279	f2_mg(nzb+1:nzt,maximum_grid_level), &
	280	f3_mg(nzb+1:nzt,maximum_grid_level) )
	281
	282	dzu_mg(:,maximum_grid_level) = dzu
[667]	283	!
[864]	284	!-- Next line to ensure an equally spaced grid.
	285	dzu_mg(1,maximum_grid_level) = dzu(2)
[709]	286
[1]	287	dzw_mg(:,maximum_grid_level) = dzw
	288	nzt_l = nzt
	289	DO l = maximum_grid_level-1, 1, -1
	290	dzu_mg(nzb+1,l) = 2.0 * dzu_mg(nzb+1,l+1)
	291	dzw_mg(nzb+1,l) = 2.0 * dzw_mg(nzb+1,l+1)
	292	nzt_l = nzt_l / 2
	293	DO k = 2, nzt_l+1
	294	dzu_mg(k,l) = dzu_mg(2k-2,l+1) + dzu_mg(2k-1,l+1)
	295	dzw_mg(k,l) = dzw_mg(2k-2,l+1) + dzw_mg(2k-1,l+1)
	296	ENDDO
	297	ENDDO
	298
	299	nzt_l = nzt
	300	dx_l = dx
	301	dy_l = dy
	302	DO l = maximum_grid_level, 1, -1
	303	ddx2_mg(l) = 1.0 / dx_l**2
	304	ddy2_mg(l) = 1.0 / dy_l**2
	305	DO k = nzb+1, nzt_l
	306	f2_mg(k,l) = 1.0 / ( dzu_mg(k+1,l) * dzw_mg(k,l) )
	307	f3_mg(k,l) = 1.0 / ( dzu_mg(k,l) * dzw_mg(k,l) )
	308	f1_mg(k,l) = 2.0 * ( ddx2_mg(l) + ddy2_mg(l) ) + &
	309	f2_mg(k,l) + f3_mg(k,l)
	310	ENDDO
	311	nzt_l = nzt_l / 2
	312	dx_l = dx_l * 2.0
	313	dy_l = dy_l * 2.0
	314	ENDDO
	315
	316	ENDIF
	317
	318	!
	319	!-- Compute the reciprocal values of the horizontal grid lengths.
	320	ddx = 1.0 / dx
	321	ddy = 1.0 / dy
	322	dx2 = dx * dx
	323	dy2 = dy * dy
	324	ddx2 = 1.0 / dx2
	325	ddy2 = 1.0 / dy2
	326
	327	!
	328	!-- Compute the grid-dependent mixing length.
	329	DO k = 1, nzt
	330	l_grid(k) = ( dx * dy * dzw(k) )**0.33333333333333
	331	ENDDO
	332
	333	!
	334	!-- Allocate outer and inner index arrays for topography and set
[114]	335	!-- defaults.
	336	!-- nzb_local has to contain additional layers of ghost points for calculating
	337	!-- the flag arrays needed for the multigrid method
	338	gls = 2**( maximum_grid_level )
[861]	339	IF ( gls < nbgp ) gls = nbgp
[667]	340
[114]	341	ALLOCATE( corner_nl(nys:nyn,nxl:nxr), corner_nr(nys:nyn,nxl:nxr), &
	342	corner_sl(nys:nyn,nxl:nxr), corner_sr(nys:nyn,nxl:nxr), &
[667]	343	nzb_local(-gls:ny+gls,-gls:nx+gls), &
	344	nzb_tmp(-nbgp:ny+nbgp,-nbgp:nx+nbgp), &
[114]	345	wall_l(nys:nyn,nxl:nxr), wall_n(nys:nyn,nxl:nxr), &
[1]	346	wall_r(nys:nyn,nxl:nxr), wall_s(nys:nyn,nxl:nxr) )
[667]	347	ALLOCATE( fwxm(nysg:nyng,nxlg:nxrg), fwxp(nysg:nyng,nxlg:nxrg), &
	348	fwym(nysg:nyng,nxlg:nxrg), fwyp(nysg:nyng,nxlg:nxrg), &
	349	fxm(nysg:nyng,nxlg:nxrg), fxp(nysg:nyng,nxlg:nxrg), &
	350	fym(nysg:nyng,nxlg:nxrg), fyp(nysg:nyng,nxlg:nxrg), &
	351	nzb_s_inner(nysg:nyng,nxlg:nxrg), &
	352	nzb_s_outer(nysg:nyng,nxlg:nxrg), &
	353	nzb_u_inner(nysg:nyng,nxlg:nxrg), &
	354	nzb_u_outer(nysg:nyng,nxlg:nxrg), &
	355	nzb_v_inner(nysg:nyng,nxlg:nxrg), &
	356	nzb_v_outer(nysg:nyng,nxlg:nxrg), &
	357	nzb_w_inner(nysg:nyng,nxlg:nxrg), &
	358	nzb_w_outer(nysg:nyng,nxlg:nxrg), &
	359	nzb_diff_s_inner(nysg:nyng,nxlg:nxrg), &
	360	nzb_diff_s_outer(nysg:nyng,nxlg:nxrg), &
	361	nzb_diff_u(nysg:nyng,nxlg:nxrg), &
	362	nzb_diff_v(nysg:nyng,nxlg:nxrg), &
	363	nzb_2d(nysg:nyng,nxlg:nxrg), &
	364	wall_e_x(nysg:nyng,nxlg:nxrg), &
	365	wall_e_y(nysg:nyng,nxlg:nxrg), &
	366	wall_u(nysg:nyng,nxlg:nxrg), &
	367	wall_v(nysg:nyng,nxlg:nxrg), &
	368	wall_w_x(nysg:nyng,nxlg:nxrg), &
	369	wall_w_y(nysg:nyng,nxlg:nxrg) )
[1]	370
	371
[667]	372
	373	ALLOCATE( l_wall(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	374
[818]	375
[1]	376	nzb_s_inner = nzb; nzb_s_outer = nzb
	377	nzb_u_inner = nzb; nzb_u_outer = nzb
	378	nzb_v_inner = nzb; nzb_v_outer = nzb
	379	nzb_w_inner = nzb; nzb_w_outer = nzb
	380
	381	!
[19]	382	!-- Define vertical gridpoint from (or to) which on the usual finite difference
[1]	383	!-- form (which does not use surface fluxes) is applied
	384	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	385	nzb_diff = nzb + 2
	386	ELSE
	387	nzb_diff = nzb + 1
	388	ENDIF
[19]	389	IF ( use_top_fluxes ) THEN
	390	nzt_diff = nzt - 1
	391	ELSE
	392	nzt_diff = nzt
	393	ENDIF
[1]	394
	395	nzb_diff_s_inner = nzb_diff; nzb_diff_s_outer = nzb_diff
	396	nzb_diff_u = nzb_diff; nzb_diff_v = nzb_diff
	397
	398	wall_e_x = 0.0; wall_e_y = 0.0; wall_u = 0.0; wall_v = 0.0
	399	wall_w_x = 0.0; wall_w_y = 0.0
	400	fwxp = 1.0; fwxm = 1.0; fwyp = 1.0; fwym = 1.0
	401	fxp = 1.0; fxm = 1.0; fyp = 1.0; fym = 1.0
	402
	403	!
	404	!-- Initialize near-wall mixing length l_wall only in the vertical direction
	405	!-- for the moment,
	406	!-- multiplication with wall_adjustment_factor near the end of this routine
	407	l_wall(nzb,:,:) = l_grid(1)
	408	DO k = nzb+1, nzt
	409	l_wall(k,:,:) = l_grid(k)
	410	ENDDO
	411	l_wall(nzt+1,:,:) = l_grid(nzt)
	412
	413	ALLOCATE ( vertical_influence(nzb:nzt) )
	414	DO k = 1, nzt
	415	vertical_influence(k) = MIN ( INT( l_grid(k) / &
	416	( wall_adjustment_factor * dzw(k) ) + 0.5 ), nzt - k )
	417	ENDDO
	418
	419	DO k = 1, MAXVAL( nzb_s_inner )
	420	IF ( l_grid(k) > 1.5 * dx * wall_adjustment_factor .OR. &
	421	l_grid(k) > 1.5 * dy * wall_adjustment_factor ) THEN
[254]	422	WRITE( message_string, * ) 'grid anisotropy exceeds ', &
	423	'threshold given by only local', &
	424	' &horizontal reduction of near_wall ', &
	425	'mixing length l_wall', &
	426	' &starting from height level k = ', k, '.'
	427	CALL message( 'init_grid', 'PA0202', 0, 1, 0, 6, 0 )
[1]	428	EXIT
	429	ENDIF
	430	ENDDO
	431	vertical_influence(0) = vertical_influence(1)
	432
[667]	433	DO i = nxlg, nxrg
	434	DO j = nysg, nyng
[1]	435	DO k = nzb_s_inner(j,i) + 1, &
	436	nzb_s_inner(j,i) + vertical_influence(nzb_s_inner(j,i))
	437	l_wall(k,j,i) = zu(k) - zw(nzb_s_inner(j,i))
	438	ENDDO
	439	ENDDO
	440	ENDDO
	441
	442	!
	443	!-- Set outer and inner index arrays for non-flat topography.
	444	!-- Here consistency checks concerning domain size and periodicity are
	445	!-- necessary.
	446	!-- Within this SELECT CASE structure only nzb_local is initialized
	447	!-- individually depending on the chosen topography type, all other index
	448	!-- arrays are initialized further below.
	449	SELECT CASE ( TRIM( topography ) )
	450
	451	CASE ( 'flat' )
	452	!
[555]	453	!-- nzb_local is required for the multigrid solver
	454	nzb_local = 0
[1]	455
	456	CASE ( 'single_building' )
	457	!
	458	!-- Single rectangular building, by default centered in the middle of the
	459	!-- total domain
	460	blx = NINT( building_length_x / dx )
	461	bly = NINT( building_length_y / dy )
	462	bh = NINT( building_height / dz )
	463
	464	IF ( building_wall_left == 9999999.9 ) THEN
	465	building_wall_left = ( nx + 1 - blx ) / 2 * dx
	466	ENDIF
	467	bxl = NINT( building_wall_left / dx )
	468	bxr = bxl + blx
	469
	470	IF ( building_wall_south == 9999999.9 ) THEN
	471	building_wall_south = ( ny + 1 - bly ) / 2 * dy
	472	ENDIF
	473	bys = NINT( building_wall_south / dy )
	474	byn = bys + bly
	475
	476	!
	477	!-- Building size has to meet some requirements
	478	IF ( ( bxl < 1 ) .OR. ( bxr > nx-1 ) .OR. ( bxr < bxl+3 ) .OR. &
	479	( bys < 1 ) .OR. ( byn > ny-1 ) .OR. ( byn < bys+3 ) ) THEN
[274]	480	WRITE( message_string, * ) 'inconsistent building parameters:', &
	481	'& bxl=', bxl, 'bxr=', bxr, 'bys=', bys, &
	482	'byn=', byn, 'nx=', nx, 'ny=', ny
[254]	483	CALL message( 'init_grid', 'PA0203', 1, 2, 0, 6, 0 )
[1]	484	ENDIF
	485
	486	!
[217]	487	!-- Define the building.
[1]	488	nzb_local = 0
[134]	489	nzb_local(bys:byn,bxl:bxr) = bh
[1]	490
[240]	491	CASE ( 'single_street_canyon' )
	492	!
	493	!-- Single quasi-2D street canyon of infinite length in x or y direction.
	494	!-- The canyon is centered in the other direction by default.
	495	IF ( canyon_width_x /= 9999999.9 ) THEN
	496	!
	497	!-- Street canyon in y direction
	498	cwx = NINT( canyon_width_x / dx )
	499	IF ( canyon_wall_left == 9999999.9 ) THEN
	500	canyon_wall_left = ( nx + 1 - cwx ) / 2 * dx
	501	ENDIF
	502	cxl = NINT( canyon_wall_left / dx )
	503	cxr = cxl + cwx
	504
	505	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	506	!
	507	!-- Street canyon in x direction
	508	cwy = NINT( canyon_width_y / dy )
	509	IF ( canyon_wall_south == 9999999.9 ) THEN
	510	canyon_wall_south = ( ny + 1 - cwy ) / 2 * dy
	511	ENDIF
	512	cys = NINT( canyon_wall_south / dy )
	513	cyn = cys + cwy
	514
	515	ELSE
[254]	516
	517	message_string = 'no street canyon width given'
	518	CALL message( 'init_grid', 'PA0204', 1, 2, 0, 6, 0 )
	519
[240]	520	ENDIF
	521
	522	ch = NINT( canyon_height / dz )
	523	dp_level_ind_b = ch
	524	!
	525	!-- Street canyon size has to meet some requirements
	526	IF ( canyon_width_x /= 9999999.9 ) THEN
	527	IF ( ( cxl < 1 ) .OR. ( cxr > nx-1 ) .OR. ( cwx < 3 ) .OR. &
	528	( ch < 3 ) ) THEN
[254]	529	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	530	'&cxl=', cxl, 'cxr=', cxr, &
	531	'cwx=', cwx, &
[254]	532	'ch=', ch, 'nx=', nx, 'ny=', ny
	533	CALL message( 'init_grid', 'PA0205', 1, 2, 0, 6, 0 )
[240]	534	ENDIF
	535	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	536	IF ( ( cys < 1 ) .OR. ( cyn > ny-1 ) .OR. ( cwy < 3 ) .OR. &
	537	( ch < 3 ) ) THEN
[254]	538	WRITE( message_string, * ) 'inconsistent canyon parameters:', &
[274]	539	'&cys=', cys, 'cyn=', cyn, &
	540	'cwy=', cwy, &
[254]	541	'ch=', ch, 'nx=', nx, 'ny=', ny
	542	CALL message( 'init_grid', 'PA0206', 1, 2, 0, 6, 0 )
[240]	543	ENDIF
	544	ENDIF
[274]	545	IF ( canyon_width_x /= 9999999.9 .AND. canyon_width_y /= 9999999.9 ) &
[240]	546	THEN
[274]	547	message_string = 'inconsistent canyon parameters:' // &
[254]	548	'&street canyon can only be oriented' // &
	549	'&either in x- or in y-direction'
	550	CALL message( 'init_grid', 'PA0207', 1, 2, 0, 6, 0 )
[240]	551	ENDIF
	552
	553	nzb_local = ch
	554	IF ( canyon_width_x /= 9999999.9 ) THEN
	555	nzb_local(:,cxl+1:cxr-1) = 0
	556	ELSEIF ( canyon_width_y /= 9999999.9 ) THEN
	557	nzb_local(cys+1:cyn-1,:) = 0
	558	ENDIF
	559
[1]	560	CASE ( 'read_from_file' )
[759]	561
[818]	562	ALLOCATE ( topo_height(0:ny,0:nx) )
	563
[759]	564	DO ii = 0, io_blocks-1
	565	IF ( ii == io_group ) THEN
	566
[1]	567	!
[759]	568	!-- Arbitrary irregular topography data in PALM format (exactly
	569	!-- matching the grid size and total domain size)
	570	OPEN( 90, FILE='TOPOGRAPHY_DATA', STATUS='OLD', &
	571	FORM='FORMATTED', ERR=10 )
	572	DO j = ny, 0, -1
	573	READ( 90, *, ERR=11, END=11 ) ( topo_height(j,i), i = 0,nx )
	574	ENDDO
	575
	576	GOTO 12
	577
	578	10 message_string = 'file TOPOGRAPHY_DATA does not exist'
	579	CALL message( 'init_grid', 'PA0208', 1, 2, 0, 6, 0 )
	580
	581	11 message_string = 'errors in file TOPOGRAPHY_DATA'
	582	CALL message( 'init_grid', 'PA0209', 1, 2, 0, 6, 0 )
	583
	584	12 CLOSE( 90 )
	585
	586	ENDIF
[809]	587	#if defined( __parallel ) && ! defined ( __check )
[759]	588	CALL MPI_BARRIER( comm2d, ierr )
	589	#endif
[559]	590	ENDDO
[759]	591
[1]	592	!
	593	!-- Calculate the index height of the topography
	594	DO i = 0, nx
	595	DO j = 0, ny
	596	nzb_local(j,i) = NINT( topo_height(j,i) / dz )
	597	ENDDO
	598	ENDDO
[818]	599
	600	DEALLOCATE ( topo_height )
[114]	601	!
[759]	602	!-- Add cyclic boundaries (additional layers are for calculating
	603	!-- flag arrays needed for the multigrid sover)
[114]	604	nzb_local(-gls:-1,0:nx) = nzb_local(ny-gls+1:ny,0:nx)
	605	nzb_local(ny+1:ny+gls,0:nx) = nzb_local(0:gls-1,0:nx)
	606	nzb_local(:,-gls:-1) = nzb_local(:,nx-gls+1:nx)
	607	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
[667]	608
[1]	609	CASE DEFAULT
	610	!
	611	!-- The DEFAULT case is reached either if the parameter topography
[217]	612	!-- contains a wrong character string or if the user has defined a special
[1]	613	!-- case in the user interface. There, the subroutine user_init_grid
	614	!-- checks which of these two conditions applies.
[114]	615	CALL user_init_grid( gls, nzb_local )
[1]	616
	617	END SELECT
	618	!
[861]	619	!-- Determine the maximum level of topography. Furthermore it is used for
	620	!-- steering the degradation of order of the applied advection scheme.
[978]	621	!-- In case of non-cyclic lateral boundaries, the order of the advection
[996]	622	!-- scheme have to be reduced up to nzt (required at the lateral boundaries).
[861]	623	nzb_max = MAXVAL( nzb_local )
[978]	624	IF ( inflow_l .OR. outflow_l .OR. inflow_r .OR. outflow_r .OR. &
	625	inflow_n .OR. outflow_n .OR. inflow_s .OR. outflow_s ) THEN
	626	nzb_max = nzt
	627	ENDIF
	628
[861]	629	!
[1]	630	!-- Consistency checks and index array initialization are only required for
[217]	631	!-- non-flat topography, also the initialization of topography height arrays
[49]	632	!-- zu_s_inner and zw_w_inner
[1]	633	IF ( TRIM( topography ) /= 'flat' ) THEN
	634
	635	!
	636	!-- Consistency checks
	637	IF ( MINVAL( nzb_local ) < 0 .OR. MAXVAL( nzb_local ) > nz + 1 ) THEN
[274]	638	WRITE( message_string, * ) 'nzb_local values are outside the', &
	639	'model domain', &
	640	'&MINVAL( nzb_local ) = ', MINVAL(nzb_local), &
	641	'&MAXVAL( nzb_local ) = ', MAXVAL(nzb_local)
[254]	642	CALL message( 'init_grid', 'PA0210', 1, 2, 0, 6, 0 )
[1]	643	ENDIF
	644
[722]	645	IF ( bc_lr == 'cyclic' ) THEN
[1]	646	IF ( ANY( nzb_local(:,-1) /= nzb_local(:,nx) ) .OR. &
	647	ANY( nzb_local(:,0) /= nzb_local(:,nx+1) ) ) THEN
[254]	648	message_string = 'nzb_local does not fulfill cyclic' // &
	649	' boundary condition in x-direction'
	650	CALL message( 'init_grid', 'PA0211', 1, 2, 0, 6, 0 )
[1]	651	ENDIF
	652	ENDIF
[722]	653	IF ( bc_ns == 'cyclic' ) THEN
[1]	654	IF ( ANY( nzb_local(-1,:) /= nzb_local(ny,:) ) .OR. &
	655	ANY( nzb_local(0,:) /= nzb_local(ny+1,:) ) ) THEN
[254]	656	message_string = 'nzb_local does not fulfill cyclic' // &
	657	' boundary condition in y-direction'
	658	CALL message( 'init_grid', 'PA0212', 1, 2, 0, 6, 0 )
[1]	659	ENDIF
	660	ENDIF
	661
[217]	662	IF ( topography_grid_convention == 'cell_edge' ) THEN
[134]	663	!
[217]	664	!-- The array nzb_local as defined using the 'cell_edge' convention
	665	!-- describes the actual total size of topography which is defined at the
	666	!-- cell edges where u=0 on the topography walls in x-direction and v=0
	667	!-- on the topography walls in y-direction. However, PALM uses individual
	668	!-- arrays nzb_u\|v\|w\|s_inner\|outer that are based on nzb_s_inner.
	669	!-- Therefore, the extent of topography in nzb_local is now reduced by
	670	!-- 1dx at the E topography walls and by 1dy at the N topography walls
	671	!-- to form the basis for nzb_s_inner.
	672	DO j = -gls, ny + gls
	673	DO i = -gls, nx
	674	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j,i+1) )
	675	ENDDO
[134]	676	ENDDO
[217]	677	!-- apply cyclic boundary conditions in x-direction
	678	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	679	nzb_local(:,nx+1:nx+gls) = nzb_local(:,0:gls-1)
	680	DO i = -gls, nx + gls
	681	DO j = -gls, ny
	682	nzb_local(j,i) = MIN( nzb_local(j,i), nzb_local(j+1,i) )
	683	ENDDO
[134]	684	ENDDO
[217]	685	!-- apply cyclic boundary conditions in y-direction
	686	!(ist das erforderlich? Ursache von Seung Bus Fehler?)
	687	nzb_local(ny+1:ny+gls,:) = nzb_local(0:gls-1,:)
	688	ENDIF
[134]	689
[1]	690	!
	691	!-- Initialize index arrays nzb_s_inner and nzb_w_inner
[861]	692	nzb_s_inner = nzb_local(nysg:nyng,nxlg:nxrg)
	693	nzb_w_inner = nzb_local(nysg:nyng,nxlg:nxrg)
[1]	694
	695	!
	696	!-- Initialize remaining index arrays:
	697	!-- first pre-initialize them with nzb_s_inner...
	698	nzb_u_inner = nzb_s_inner
	699	nzb_u_outer = nzb_s_inner
	700	nzb_v_inner = nzb_s_inner
	701	nzb_v_outer = nzb_s_inner
	702	nzb_w_outer = nzb_s_inner
	703	nzb_s_outer = nzb_s_inner
	704
	705	!
	706	!-- ...then extend pre-initialized arrays in their according directions
	707	!-- based on nzb_local using nzb_tmp as a temporary global index array
	708
	709	!
	710	!-- nzb_s_outer:
	711	!-- extend nzb_local east-/westwards first, then north-/southwards
[667]	712	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	713	DO j = -1, ny + 1
	714	DO i = 0, nx
	715	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i), &
	716	nzb_local(j,i+1) )
	717	ENDDO
	718	ENDDO
	719	DO i = nxl, nxr
	720	DO j = nys, nyn
	721	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	722	nzb_tmp(j+1,i) )
	723	ENDDO
	724	!
	725	!-- non-cyclic boundary conditions (overwritten by call of
	726	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	727	IF ( nys == 0 ) THEN
	728	j = -1
	729	nzb_s_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	730	ENDIF
	731	IF ( nys == ny ) THEN
	732	j = ny + 1
	733	nzb_s_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	734	ENDIF
	735	ENDDO
	736	!
	737	!-- nzb_w_outer:
	738	!-- identical to nzb_s_outer
	739	nzb_w_outer = nzb_s_outer
	740
	741	!
	742	!-- nzb_u_inner:
	743	!-- extend nzb_local rightwards only
[667]	744	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	745	DO j = -1, ny + 1
	746	DO i = 0, nx + 1
	747	nzb_tmp(j,i) = MAX( nzb_local(j,i-1), nzb_local(j,i) )
	748	ENDDO
	749	ENDDO
[667]	750	nzb_u_inner = nzb_tmp(nysg:nyng,nxlg:nxrg)
[1]	751
	752	!
	753	!-- nzb_u_outer:
	754	!-- extend current nzb_tmp (nzb_u_inner) north-/southwards
	755	DO i = nxl, nxr
	756	DO j = nys, nyn
	757	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i), &
	758	nzb_tmp(j+1,i) )
	759	ENDDO
	760	!
	761	!-- non-cyclic boundary conditions (overwritten by call of
	762	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	763	IF ( nys == 0 ) THEN
	764	j = -1
	765	nzb_u_outer(j,i) = MAX( nzb_tmp(j+1,i), nzb_tmp(j,i) )
	766	ENDIF
	767	IF ( nys == ny ) THEN
	768	j = ny + 1
	769	nzb_u_outer(j,i) = MAX( nzb_tmp(j-1,i), nzb_tmp(j,i) )
	770	ENDIF
	771	ENDDO
	772
	773	!
	774	!-- nzb_v_inner:
	775	!-- extend nzb_local northwards only
[667]	776	nzb_tmp = nzb_local(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[1]	777	DO i = -1, nx + 1
	778	DO j = 0, ny + 1
	779	nzb_tmp(j,i) = MAX( nzb_local(j-1,i), nzb_local(j,i) )
	780	ENDDO
	781	ENDDO
[667]	782	nzb_v_inner = nzb_tmp(nys-nbgp:nyn+nbgp,nxl-nbgp:nxr+nbgp)
[1]	783
	784	!
	785	!-- nzb_v_outer:
	786	!-- extend current nzb_tmp (nzb_v_inner) right-/leftwards
	787	DO j = nys, nyn
	788	DO i = nxl, nxr
	789	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i), &
	790	nzb_tmp(j,i+1) )
	791	ENDDO
	792	!
	793	!-- non-cyclic boundary conditions (overwritten by call of
	794	!-- exchange_horiz_2d_int below in case of cyclic boundary conditions)
	795	IF ( nxl == 0 ) THEN
	796	i = -1
	797	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i+1), nzb_tmp(j,i) )
	798	ENDIF
	799	IF ( nxr == nx ) THEN
	800	i = nx + 1
	801	nzb_v_outer(j,i) = MAX( nzb_tmp(j,i-1), nzb_tmp(j,i) )
	802	ENDIF
	803	ENDDO
[809]	804	#if ! defined ( __check )
[1]	805	!
	806	!-- Exchange of lateral boundary values (parallel computers) and cyclic
	807	!-- boundary conditions, if applicable.
	808	!-- Since nzb_s_inner and nzb_w_inner are derived directly from nzb_local
	809	!-- they do not require exchange and are not included here.
	810	CALL exchange_horiz_2d_int( nzb_u_inner )
	811	CALL exchange_horiz_2d_int( nzb_u_outer )
	812	CALL exchange_horiz_2d_int( nzb_v_inner )
	813	CALL exchange_horiz_2d_int( nzb_v_outer )
	814	CALL exchange_horiz_2d_int( nzb_w_outer )
	815	CALL exchange_horiz_2d_int( nzb_s_outer )
	816
[49]	817	!
	818	!-- Allocate and set the arrays containing the topography height
	819	IF ( myid == 0 ) THEN
	820
	821	ALLOCATE( zu_s_inner(0:nx+1,0:ny+1), zw_w_inner(0:nx+1,0:ny+1) )
	822
	823	DO i = 0, nx + 1
	824	DO j = 0, ny + 1
	825	zu_s_inner(i,j) = zu(nzb_local(j,i))
	826	zw_w_inner(i,j) = zw(nzb_local(j,i))
	827	ENDDO
	828	ENDDO
	829
	830	ENDIF
[807]	831	#endif
[1]	832	ENDIF
	833
[809]	834	#if ! defined ( __check )
[1]	835	!
	836	!-- Preliminary: to be removed after completion of the topography code!
	837	!-- Set the former default k index arrays nzb_2d
	838	nzb_2d = nzb
	839
	840	!
	841	!-- Set the individual index arrays which define the k index from which on
	842	!-- the usual finite difference form (which does not use surface fluxes) is
	843	!-- applied
	844	IF ( prandtl_layer .OR. use_surface_fluxes ) THEN
	845	nzb_diff_u = nzb_u_inner + 2
	846	nzb_diff_v = nzb_v_inner + 2
	847	nzb_diff_s_inner = nzb_s_inner + 2
	848	nzb_diff_s_outer = nzb_s_outer + 2
	849	ELSE
	850	nzb_diff_u = nzb_u_inner + 1
	851	nzb_diff_v = nzb_v_inner + 1
	852	nzb_diff_s_inner = nzb_s_inner + 1
	853	nzb_diff_s_outer = nzb_s_outer + 1
	854	ENDIF
	855
	856	!
	857	!-- Calculation of wall switches and factors required by diffusion_u/v.f90 and
	858	!-- for limitation of near-wall mixing length l_wall further below
	859	corner_nl = 0
	860	corner_nr = 0
	861	corner_sl = 0
	862	corner_sr = 0
	863	wall_l = 0
	864	wall_n = 0
	865	wall_r = 0
	866	wall_s = 0
	867
	868	DO i = nxl, nxr
	869	DO j = nys, nyn
	870	!
	871	!-- u-component
	872	IF ( nzb_u_outer(j,i) > nzb_u_outer(j+1,i) ) THEN
	873	wall_u(j,i) = 1.0 ! north wall (location of adjacent fluid)
	874	fym(j,i) = 0.0
	875	fyp(j,i) = 1.0
	876	ELSEIF ( nzb_u_outer(j,i) > nzb_u_outer(j-1,i) ) THEN
	877	wall_u(j,i) = 1.0 ! south wall (location of adjacent fluid)
	878	fym(j,i) = 1.0
	879	fyp(j,i) = 0.0
	880	ENDIF
	881	!
	882	!-- v-component
	883	IF ( nzb_v_outer(j,i) > nzb_v_outer(j,i+1) ) THEN
	884	wall_v(j,i) = 1.0 ! rigth wall (location of adjacent fluid)
	885	fxm(j,i) = 0.0
	886	fxp(j,i) = 1.0
	887	ELSEIF ( nzb_v_outer(j,i) > nzb_v_outer(j,i-1) ) THEN
	888	wall_v(j,i) = 1.0 ! left wall (location of adjacent fluid)
	889	fxm(j,i) = 1.0
	890	fxp(j,i) = 0.0
	891	ENDIF
	892	!
	893	!-- w-component, also used for scalars, separate arrays for shear
	894	!-- production of tke
	895	IF ( nzb_w_outer(j,i) > nzb_w_outer(j+1,i) ) THEN
	896	wall_e_y(j,i) = 1.0 ! north wall (location of adjacent fluid)
	897	wall_w_y(j,i) = 1.0
	898	fwym(j,i) = 0.0
	899	fwyp(j,i) = 1.0
	900	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j-1,i) ) THEN
	901	wall_e_y(j,i) = -1.0 ! south wall (location of adjacent fluid)
	902	wall_w_y(j,i) = 1.0
	903	fwym(j,i) = 1.0
	904	fwyp(j,i) = 0.0
	905	ENDIF
	906	IF ( nzb_w_outer(j,i) > nzb_w_outer(j,i+1) ) THEN
	907	wall_e_x(j,i) = 1.0 ! right wall (location of adjacent fluid)
	908	wall_w_x(j,i) = 1.0
	909	fwxm(j,i) = 0.0
	910	fwxp(j,i) = 1.0
	911	ELSEIF ( nzb_w_outer(j,i) > nzb_w_outer(j,i-1) ) THEN
	912	wall_e_x(j,i) = -1.0 ! left wall (location of adjacent fluid)
	913	wall_w_x(j,i) = 1.0
	914	fwxm(j,i) = 1.0
	915	fwxp(j,i) = 0.0
	916	ENDIF
	917	!
	918	!-- Wall and corner locations inside buildings for limitation of
	919	!-- near-wall mixing length l_wall
	920	IF ( nzb_s_inner(j,i) > nzb_s_inner(j+1,i) ) THEN
	921
	922	wall_n(j,i) = nzb_s_inner(j+1,i) + 1 ! North wall
	923
	924	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	925	corner_nl(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northleft corner
	926	nzb_s_inner(j,i-1) ) + 1
	927	ENDIF
	928
	929	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	930	corner_nr(j,i) = MAX( nzb_s_inner(j+1,i), & ! Northright corner
	931	nzb_s_inner(j,i+1) ) + 1
	932	ENDIF
	933
	934	ENDIF
	935
	936	IF ( nzb_s_inner(j,i) > nzb_s_inner(j-1,i) ) THEN
	937
	938	wall_s(j,i) = nzb_s_inner(j-1,i) + 1 ! South wall
	939	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	940	corner_sl(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southleft corner
	941	nzb_s_inner(j,i-1) ) + 1
	942	ENDIF
	943
	944	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	945	corner_sr(j,i) = MAX( nzb_s_inner(j-1,i), & ! Southright corner
	946	nzb_s_inner(j,i+1) ) + 1
	947	ENDIF
	948
	949	ENDIF
	950
	951	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i-1) ) THEN
	952	wall_l(j,i) = nzb_s_inner(j,i-1) + 1 ! Left wall
	953	ENDIF
	954
	955	IF ( nzb_s_inner(j,i) > nzb_s_inner(j,i+1) ) THEN
	956	wall_r(j,i) = nzb_s_inner(j,i+1) + 1 ! Right wall
	957	ENDIF
	958
	959	ENDDO
	960	ENDDO
	961
	962	!
[114]	963	!-- Calculate wall flag arrays for the multigrid method
	964	IF ( psolver == 'multigrid' ) THEN
	965	!
	966	!-- Gridpoint increment of the current level
	967	inc = 1
	968
	969	DO l = maximum_grid_level, 1 , -1
	970
	971	nxl_l = nxl_mg(l)
	972	nxr_l = nxr_mg(l)
	973	nys_l = nys_mg(l)
	974	nyn_l = nyn_mg(l)
	975	nzt_l = nzt_mg(l)
	976
	977	!
	978	!-- Assign the flag level to be calculated
	979	SELECT CASE ( l )
	980	CASE ( 1 )
	981	flags => wall_flags_1
	982	CASE ( 2 )
	983	flags => wall_flags_2
	984	CASE ( 3 )
	985	flags => wall_flags_3
	986	CASE ( 4 )
	987	flags => wall_flags_4
	988	CASE ( 5 )
	989	flags => wall_flags_5
	990	CASE ( 6 )
	991	flags => wall_flags_6
	992	CASE ( 7 )
	993	flags => wall_flags_7
	994	CASE ( 8 )
	995	flags => wall_flags_8
	996	CASE ( 9 )
	997	flags => wall_flags_9
	998	CASE ( 10 )
	999	flags => wall_flags_10
	1000	END SELECT
	1001
	1002	!
	1003	!-- Depending on the grid level, set the respective bits in case of
	1004	!-- neighbouring walls
	1005	!-- Bit 0: wall to the bottom
	1006	!-- Bit 1: wall to the top (not realized in remaining PALM code so far)
	1007	!-- Bit 2: wall to the south
	1008	!-- Bit 3: wall to the north
	1009	!-- Bit 4: wall to the left
	1010	!-- Bit 5: wall to the right
[116]	1011	!-- Bit 6: inside building
[114]	1012
	1013	flags = 0
	1014
[927]	1015	!
	1016	!-- In case of masking method, flags are not set and multigrid method
	1017	!-- works like FFT-solver
	1018	IF ( .NOT. masking_method ) THEN
	1019
	1020	DO i = nxl_l-1, nxr_l+1
	1021	DO j = nys_l-1, nyn_l+1
	1022	DO k = nzb, nzt_l+1
[114]	1023
	1024	!
[927]	1025	!-- Inside/outside building (inside building does not need
	1026	!-- further tests for walls)
	1027	IF ( kinc <= nzb_local(jinc,i*inc) ) THEN
[114]	1028
[927]	1029	flags(k,j,i) = IBSET( flags(k,j,i), 6 )
[114]	1030
[927]	1031	ELSE
[114]	1032	!
[927]	1033	!-- Bottom wall
	1034	IF ( (k-1)inc <= nzb_local(jinc,i*inc) ) THEN
	1035	flags(k,j,i) = IBSET( flags(k,j,i), 0 )
	1036	ENDIF
[114]	1037	!
[927]	1038	!-- South wall
	1039	IF ( kinc <= nzb_local((j-1)inc,i*inc) ) THEN
	1040	flags(k,j,i) = IBSET( flags(k,j,i), 2 )
	1041	ENDIF
[114]	1042	!
[927]	1043	!-- North wall
	1044	IF ( kinc <= nzb_local((j+1)inc,i*inc) ) THEN
	1045	flags(k,j,i) = IBSET( flags(k,j,i), 3 )
	1046	ENDIF
[114]	1047	!
[927]	1048	!-- Left wall
	1049	IF ( kinc <= nzb_local(jinc,(i-1)*inc) ) THEN
	1050	flags(k,j,i) = IBSET( flags(k,j,i), 4 )
	1051	ENDIF
[114]	1052	!
[927]	1053	!-- Right wall
	1054	IF ( kinc <= nzb_local(jinc,(i+1)*inc) ) THEN
	1055	flags(k,j,i) = IBSET( flags(k,j,i), 5 )
	1056	ENDIF
	1057
[114]	1058	ENDIF
	1059
[927]	1060	ENDDO
[114]	1061	ENDDO
	1062	ENDDO
	1063
[927]	1064	ENDIF
	1065
[114]	1066	!
	1067	!-- Test output of flag arrays
[145]	1068	! i = nxl_l
	1069	! WRITE (9,*) ' '
	1070	! WRITE (9,) ' mg level ', l, ' *', mg_switch_to_pe0_level
	1071	! WRITE (9,*) ' inc=', inc, ' i =', nxl_l
	1072	! WRITE (9,*) ' nxl_l',nxl_l,' nxr_l=',nxr_l,' nys_l=',nys_l,' nyn_l=',nyn_l
	1073	! DO k = nzt_l+1, nzb, -1
	1074	! WRITE (9,'(194(1X,I2))') ( flags(k,j,i), j = nys_l-1, nyn_l+1 )
	1075	! ENDDO
[114]	1076
	1077	inc = inc * 2
	1078
	1079	ENDDO
	1080
	1081	ENDIF
[861]	1082	!
	1083	!-- Allocate flags needed for masking walls.
	1084	ALLOCATE( wall_flags_0(nzb:nzt,nys:nyn,nxl:nxr) )
	1085	wall_flags_0 = 0
[114]	1086
[861]	1087	IF ( scalar_advec == 'ws-scheme' ) THEN
[114]	1088	!
[861]	1089	!-- Set flags to steer the degradation of the advection scheme in advec_ws
	1090	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1091	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1092	!-- grid points.
	1093	DO i = nxl, nxr
	1094	DO j = nys, nyn
	1095	DO k = nzb_s_inner(j,i)+1, nzt
	1096	!
	1097	!-- scalar - x-direction
	1098	!-- WS1 (0), WS3 (1), WS5 (2)
[978]	1099	IF ( k <= nzb_s_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1100	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1101	.AND. i == nxr ) ) THEN
[861]	1102	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 0 )
	1103	ELSEIF ( k <= nzb_s_inner(j,i+2) .OR. k <= nzb_s_inner(j,i-1) &
[978]	1104	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1105	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1106	) THEN
[861]	1107	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 1 )
	1108	ELSE
	1109	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 2 )
	1110	ENDIF
	1111	!
	1112	!-- scalar - y-direction
	1113	!-- WS1 (3), WS3 (4), WS5 (5)
[978]	1114	IF ( k <= nzb_s_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1115	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1116	.AND. j == nyn ) ) THEN
[861]	1117	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 3 )
	1118	!-- WS3
	1119	ELSEIF ( k <= nzb_s_inner(j+2,i) .OR. k <= nzb_s_inner(j-1,i) &
[978]	1120	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1121	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1122	) THEN
[861]	1123	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 4 )
	1124	!-- WS5
	1125	ELSE
	1126	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 5 )
	1127	ENDIF
	1128	!
	1129	!-- scalar - z-direction
	1130	!-- WS1 (6), WS3 (7), WS5 (8)
	1131	flag_set = .FALSE.
	1132	IF ( k == nzb_s_inner(j,i) + 1 .OR. k == nzt ) THEN
	1133	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 6 )
	1134	flag_set = .TRUE.
	1135	ELSEIF ( k == nzb_s_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1136	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 7 )
	1137	flag_set = .TRUE.
	1138	ELSEIF ( k > nzb_s_inner(j,i) .AND. .NOT. flag_set ) THEN
	1139	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 8 )
	1140	ENDIF
	1141	ENDDO
	1142	ENDDO
	1143	ENDDO
	1144	ENDIF
	1145
	1146	IF ( momentum_advec == 'ws-scheme' ) THEN
	1147	!
	1148	!-- Set wall_flags_0 to steer the degradation of the advection scheme in advec_ws
	1149	!-- near topography, inflow- and outflow boundaries as well as bottom and
	1150	!-- top of model domain. wall_flags_0 remains zero for all non-prognostic
	1151	!-- grid points.
	1152	DO i = nxl, nxr
	1153	DO j = nys, nyn
	1154	DO k = nzb_u_inner(j,i)+1, nzt
	1155	!
	1156	!-- u component - x-direction
	1157	!-- WS1 (9), WS3 (10), WS5 (11)
	1158	IF ( k <= nzb_u_inner(j,i+1) &
[978]	1159	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1160	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr ) &
	1161	) THEN
[861]	1162	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 9 )
	1163	ELSEIF ( k <= nzb_u_inner(j,i+2) .OR. k <= nzb_u_inner(j,i-1) &
[978]	1164	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 )&
	1165	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu+1)&
	1166	) THEN
[861]	1167	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 10 )
	1168	ELSE
	1169	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 11 )
	1170	ENDIF
[978]	1171
[861]	1172	!
	1173	!-- u component - y-direction
	1174	!-- WS1 (12), WS3 (13), WS5 (14)
[978]	1175	IF ( k <= nzb_u_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1176	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1177	.AND. j == nyn ) ) THEN
[861]	1178	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 12 )
	1179	ELSEIF ( k <= nzb_u_inner(j+2,i) .OR. k <= nzb_u_inner(j-1,i) &
[978]	1180	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1181	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1182	) THEN
[861]	1183	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 13 )
	1184	ELSE
	1185	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 14 )
	1186	ENDIF
	1187	!
	1188	!-- u component - z-direction
	1189	!-- WS1 (15), WS3 (16), WS5 (17)
	1190	flag_set = .FALSE.
	1191	IF ( k == nzb_u_inner(j,i) + 1 .OR. k == nzt ) THEN
	1192	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 15 )
	1193	flag_set = .TRUE.
	1194	ELSEIF ( k == nzb_u_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1195	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 16 )
	1196	flag_set = .TRUE.
	1197	ELSEIF ( k > nzb_u_inner(j,i) .AND. .NOT. flag_set ) THEN
	1198	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 17 )
	1199	ENDIF
	1200
	1201	ENDDO
	1202	ENDDO
	1203	ENDDO
	1204
	1205	DO i = nxl, nxr
	1206	DO j = nys, nyn
	1207	DO k = nzb_v_inner(j,i)+1, nzt
	1208	!
	1209	!-- v component - x-direction
	1210	!-- WS1 (18), WS3 (19), WS5 (20)
[978]	1211	IF ( k <= nzb_v_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1212	.AND. i == nxl ) .OR. (( inflow_r .OR. outflow_r ) &
	1213	.AND. i == nxr ) ) THEN
[861]	1214	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 18 )
	1215	!-- WS3
	1216	ELSEIF ( k <= nzb_v_inner(j,i+2) .OR. k <= nzb_v_inner(j,i-1) &
[978]	1217	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1218	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1219	) THEN
[861]	1220	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 19 )
	1221	ELSE
	1222	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 20 )
	1223	ENDIF
	1224	!
	1225	!-- v component - y-direction
	1226	!-- WS1 (21), WS3 (22), WS5 (23)
	1227	IF ( k <= nzb_v_inner(j+1,i) &
[978]	1228	.OR. ( ( inflow_s .OR. outflow_s ) .AND. i == nysv ) &
	1229	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn ) &
	1230	) THEN
[861]	1231	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 21 )
	1232	ELSEIF ( k <= nzb_v_inner(j+2,i) .OR. k <= nzb_v_inner(j-1,i) &
[978]	1233	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv+1 )&
	1234	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 )&
	1235	) THEN
[861]	1236	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 22 )
	1237	ELSE
	1238	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 23 )
	1239	ENDIF
	1240	!
	1241	!-- v component - z-direction
	1242	!-- WS1 (24), WS3 (25), WS5 (26)
	1243	flag_set = .FALSE.
	1244	IF ( k == nzb_v_inner(j,i) + 1 .OR. k == nzt ) THEN
	1245	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 24 )
	1246	flag_set = .TRUE.
	1247	ELSEIF ( k == nzb_v_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1248	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 25 )
	1249	flag_set = .TRUE.
	1250	ELSEIF ( k > nzb_v_inner(j,i) .AND. .NOT. flag_set ) THEN
	1251	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 26 )
	1252	ENDIF
	1253
	1254	ENDDO
	1255	ENDDO
	1256	ENDDO
	1257	DO i = nxl, nxr
	1258	DO j = nys, nyn
[1015]	1259	DO k = nzb_w_inner(j,i), nzt
[861]	1260	!
	1261	!-- w component - x-direction
	1262	!-- WS1 (27), WS3 (28), WS5 (29)
[978]	1263	IF ( k <= nzb_w_inner(j,i+1) .OR. ( ( inflow_l .OR. outflow_l )&
	1264	.AND. i == nxl ) .OR. ( ( inflow_r .OR. outflow_r ) &
	1265	.AND. i == nxr ) ) THEN
[861]	1266	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 27 )
	1267	ELSEIF ( k <= nzb_w_inner(j,i+2) .OR. k <= nzb_w_inner(j,i-1) &
[978]	1268	.OR. ( ( inflow_r .OR. outflow_r ) .AND. i == nxr-1 ) &
	1269	.OR. ( ( inflow_l .OR. outflow_l ) .AND. i == nxlu ) &
	1270	) THEN
[861]	1271	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 28 )
	1272	ELSE
	1273	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i),29 )
	1274	ENDIF
	1275	!
	1276	!-- w component - y-direction
	1277	!-- WS1 (30), WS3 (31), WS5 (32)
[978]	1278	IF ( k <= nzb_w_inner(j+1,i) .OR. ( ( inflow_s .OR. outflow_s )&
	1279	.AND. j == nys ) .OR. ( ( inflow_n .OR. outflow_n ) &
	1280	.AND. j == nyn ) ) THEN
[861]	1281	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 30 )
	1282	ELSEIF ( k <= nzb_w_inner(j+2,i) .OR. k <= nzb_w_inner(j-1,i) &
[978]	1283	.OR. ( ( inflow_s .OR. outflow_s ) .AND. j == nysv ) &
	1284	.OR. ( ( inflow_n .OR. outflow_n ) .AND. j == nyn-1 ) &
	1285	) THEN
[861]	1286	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 31 )
	1287	ELSE
	1288	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 32 )
	1289	ENDIF
	1290	!
	1291	!-- w component - z-direction
	1292	!-- WS1 (33), WS3 (34), WS5 (35)
	1293	flag_set = .FALSE.
	1294	IF ( k == nzb_w_inner(j,i) .OR. k == nzb_w_inner(j,i) + 1 &
	1295	.OR. k == nzt ) THEN
	1296	!
	1297	!-- Please note, at k == nzb_w_inner(j,i) a flag is explictely
	1298	!-- set, although this is not a prognostic level. However,
	1299	!-- contrary to the advection of u,v and s this is necessary
	1300	!-- because flux_t(nzb_w_inner(j,i)) is used for the tendency
	1301	!-- at k == nzb_w_inner(j,i)+1.
	1302	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 33 )
	1303	flag_set = .TRUE.
	1304	ELSEIF ( k == nzb_w_inner(j,i) + 2 .OR. k == nzt - 1 ) THEN
	1305	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 34 )
	1306	flag_set = .TRUE.
	1307	ELSEIF ( k > nzb_w_inner(j,i) .AND. .NOT. flag_set ) THEN
	1308	wall_flags_0(k,j,i) = IBSET( wall_flags_0(k,j,i), 35 )
	1309	ENDIF
	1310
	1311	ENDDO
	1312	ENDDO
	1313	ENDDO
	1314
	1315	ENDIF
	1316
	1317	!
[1]	1318	!-- In case of topography: limit near-wall mixing length l_wall further:
	1319	!-- Go through all points of the subdomain one by one and look for the closest
	1320	!-- surface
	1321	IF ( TRIM(topography) /= 'flat' ) THEN
	1322	DO i = nxl, nxr
	1323	DO j = nys, nyn
	1324
	1325	nzb_si = nzb_s_inner(j,i)
	1326	vi = vertical_influence(nzb_si)
	1327
	1328	IF ( wall_n(j,i) > 0 ) THEN
	1329	!
	1330	!-- North wall (y distance)
	1331	DO k = wall_n(j,i), nzb_si
	1332	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), 0.5 * dy )
	1333	ENDDO
	1334	!
	1335	!-- Above North wall (yz distance)
	1336	DO k = nzb_si + 1, nzb_si + vi
	1337	l_wall(k,j+1,i) = MIN( l_wall(k,j+1,i), &
	1338	SQRT( 0.25 * dy**2 + &
	1339	( zu(k) - zw(nzb_si) )**2 ) )
	1340	ENDDO
	1341	!
	1342	!-- Northleft corner (xy distance)
	1343	IF ( corner_nl(j,i) > 0 ) THEN
	1344	DO k = corner_nl(j,i), nzb_si
	1345	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1346	0.5 * SQRT( dx2 + dy2 ) )
	1347	ENDDO
	1348	!
	1349	!-- Above Northleft corner (xyz distance)
	1350	DO k = nzb_si + 1, nzb_si + vi
	1351	l_wall(k,j+1,i-1) = MIN( l_wall(k,j+1,i-1), &
	1352	SQRT( 0.25 * (dx2 + dy2) + &
	1353	( zu(k) - zw(nzb_si) )**2 ) )
	1354	ENDDO
	1355	ENDIF
	1356	!
	1357	!-- Northright corner (xy distance)
	1358	IF ( corner_nr(j,i) > 0 ) THEN
	1359	DO k = corner_nr(j,i), nzb_si
	1360	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1361	0.5 * SQRT( dx2 + dy2 ) )
	1362	ENDDO
	1363	!
	1364	!-- Above northright corner (xyz distance)
	1365	DO k = nzb_si + 1, nzb_si + vi
	1366	l_wall(k,j+1,i+1) = MIN( l_wall(k,j+1,i+1), &
	1367	SQRT( 0.25 * (dx2 + dy2) + &
	1368	( zu(k) - zw(nzb_si) )**2 ) )
	1369	ENDDO
	1370	ENDIF
	1371	ENDIF
	1372
	1373	IF ( wall_s(j,i) > 0 ) THEN
	1374	!
	1375	!-- South wall (y distance)
	1376	DO k = wall_s(j,i), nzb_si
	1377	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), 0.5 * dy )
	1378	ENDDO
	1379	!
	1380	!-- Above south wall (yz distance)
	1381	DO k = nzb_si + 1, &
	1382	nzb_si + vi
	1383	l_wall(k,j-1,i) = MIN( l_wall(k,j-1,i), &
	1384	SQRT( 0.25 * dy**2 + &
	1385	( zu(k) - zw(nzb_si) )**2 ) )
	1386	ENDDO
	1387	!
	1388	!-- Southleft corner (xy distance)
	1389	IF ( corner_sl(j,i) > 0 ) THEN
	1390	DO k = corner_sl(j,i), nzb_si
	1391	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1392	0.5 * SQRT( dx2 + dy2 ) )
	1393	ENDDO
	1394	!
	1395	!-- Above southleft corner (xyz distance)
	1396	DO k = nzb_si + 1, nzb_si + vi
	1397	l_wall(k,j-1,i-1) = MIN( l_wall(k,j-1,i-1), &
	1398	SQRT( 0.25 * (dx2 + dy2) + &
	1399	( zu(k) - zw(nzb_si) )**2 ) )
	1400	ENDDO
	1401	ENDIF
	1402	!
	1403	!-- Southright corner (xy distance)
	1404	IF ( corner_sr(j,i) > 0 ) THEN
	1405	DO k = corner_sr(j,i), nzb_si
	1406	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1407	0.5 * SQRT( dx2 + dy2 ) )
	1408	ENDDO
	1409	!
	1410	!-- Above southright corner (xyz distance)
	1411	DO k = nzb_si + 1, nzb_si + vi
	1412	l_wall(k,j-1,i+1) = MIN( l_wall(k,j-1,i+1), &
	1413	SQRT( 0.25 * (dx2 + dy2) + &
	1414	( zu(k) - zw(nzb_si) )**2 ) )
	1415	ENDDO
	1416	ENDIF
	1417
	1418	ENDIF
	1419
	1420	IF ( wall_l(j,i) > 0 ) THEN
	1421	!
	1422	!-- Left wall (x distance)
	1423	DO k = wall_l(j,i), nzb_si
	1424	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), 0.5 * dx )
	1425	ENDDO
	1426	!
	1427	!-- Above left wall (xz distance)
	1428	DO k = nzb_si + 1, nzb_si + vi
	1429	l_wall(k,j,i-1) = MIN( l_wall(k,j,i-1), &
	1430	SQRT( 0.25 * dx**2 + &
	1431	( zu(k) - zw(nzb_si) )**2 ) )
	1432	ENDDO
	1433	ENDIF
	1434
	1435	IF ( wall_r(j,i) > 0 ) THEN
	1436	!
	1437	!-- Right wall (x distance)
	1438	DO k = wall_r(j,i), nzb_si
	1439	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), 0.5 * dx )
	1440	ENDDO
	1441	!
	1442	!-- Above right wall (xz distance)
	1443	DO k = nzb_si + 1, nzb_si + vi
	1444	l_wall(k,j,i+1) = MIN( l_wall(k,j,i+1), &
	1445	SQRT( 0.25 * dx**2 + &
	1446	( zu(k) - zw(nzb_si) )**2 ) )
	1447	ENDDO
	1448
	1449	ENDIF
	1450
	1451	ENDDO
	1452	ENDDO
	1453
	1454	ENDIF
	1455
	1456	!
	1457	!-- Multiplication with wall_adjustment_factor
	1458	l_wall = wall_adjustment_factor * l_wall
	1459
	1460	!
[709]	1461	!-- Set lateral boundary conditions for l_wall
[667]	1462	CALL exchange_horiz( l_wall, nbgp )
	1463
[1]	1464	DEALLOCATE( corner_nl, corner_nr, corner_sl, corner_sr, nzb_local, &
	1465	nzb_tmp, vertical_influence, wall_l, wall_n, wall_r, wall_s )
	1466
[807]	1467	#endif
[1]	1468
	1469	END SUBROUTINE init_grid

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